The Sunspot Observer - Average annual indices of solar activity - Solar activity in 2021 - September, 2021

Statistics of sunspot activity

September, 2021

Visual indices of solar activity by author's observations

Date	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	Average	%
W	42										100			31						47			102								64.40	100
Wn	11										13			0						31			43								19.60	30.43
Ws	31										87			31						16			59								44.80	69.57
n	2										5			2						3			6								3.60	100
A	1										0			0						0			1								0.40	11.11
B	0										0			0						1			2								0.60	16.67
C	0										2			1						1			0								0.80	22.22
D	1										2			1						1			3								1.60	44.44
E	0										0			0						0			0								0.00	0.00
F	0										0			0						0			0								0.00	0.00
G	0										0			0						0			0								0.00	0.00
H	0										0			0						0			0								0.00	0.00
I	0										1			0						0			0								0.20	5.56
x	1										0			0						1			3								1.00	27.78
r	0										0			0						1			0								0.20	5.56
s	0										2			0						0			0								0.40	11.11
a	1										1			2						1			2								1.40	38.89
h	0										0			0						0			0								0.00	0.00
k	0										2			0						0			1								0.60	16.67
x	1										1			0						0			1								0.60	16.67
o	0										2			2						2			4								2.00	55.56
i	1										1			0						1			1								0.80	22.22
c	0										1			0						0			0								0.20	5.56
CV	23										130			27						27			89								59.20	100
CVn	1										11			0						8			41								12.20	20.61
CVs	22										119			27						19			48								47.00	79.39
gr	1										4			2						3			5								3.00	83.33
grfp	12										26			3						6			14								12.20	43.88
grf	9										23			8						11			27								15.60	56.12
efp	0										1			0						0			0								0.20	5.56
ef	1										0			0						0			1								0.40	11.11
Cond	3										3			4						3			2								3.00	40.00